Abstract

We demonstrate nanoresonator enabled ultrafast all‐optical switching of terahertz transmission based on phase transition of vanadium dioxide
thin film. Nanoresonators, nm‐width slot antenna
patterns on the gold layer, are fabricated on the
films. Without nanoresonators, THz wave shows negligible change through bare
film even though optical pumping exists, while about 20 percents switching ratio is clearly seen with nanoresonator patterns on the
The switching time is in a few hundreds femtosecond time scales.